#include <stdio.h>


int main()
{
    int i,j,n =0,x;
    for(i = 23;n == 0;i+=2)
    {
        for(j = 1,x =i;j <= 4 && x>= 11;j++)
        {
            if((x+1)%(j+1)==0)
            {
                x -= (x+1)/(j+1);
            }else{
                x = 0;
                break;
            }
        }
        if(j == 5 && x == 11)
        {
            printf("There are %d fishes at first.\n",i);
            n = 1;
        }
    }
    

    return 0;
}

//熊贤豪